https://doi.org/10.1140/epjst/e2019-900136-9
Regular Article
Formation of the microstructure of rapidly solidified hypoeutectic Al-Si alloy
1
Department of Nuclear and Radiation Safety, International Sakharov Environmental Institute of Belarusian State University 23/1 Dolgobrodskaya str., 220070 Minsk, Belarus
2
Department of Solid State Physics, Belarusian State University 4 Nezavisimosti ave., 220030 Minsk Belarus
3
Department of Theoretical and Mathematical Physics, Laboratory of Multi-Scale Mathematical Modeling, Ural Federal University, Lenin ave., 51 620000 Ekaterinburg, Russia
a e-mail: gusakova@gmail.com
Received:
12
July
2019
Received in final form:
5
September
2019
Published online:
11
February
2020
The authors present results on microstructure and component distribution of industrial hypoeutectic Al-Si alloy, obtained at cooling rates of 102 and 105 K/s. Bulk samples are characterized by a heterogeneous structure that represents the large dendrites of a solid solution based on aluminum, and a eutectic lamellar mixture of aluminum and silicon filling the interdendritic spacing. The rapidly solidified foils are characterized by more dispersive microstructure and chemical homogeneity; however, they have a microstructure layering in the form of a cross-section. It was established that crystallization proceeds according to the fundamentally different mechanisms: near-equilibrium crystallization for bulk samples, and chemically partitionless crystallization for rapidly solidified foils.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature, 2020
